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StarHub roaming Japan: plans, charges, and activation
StarHub roaming Japan guide: Full breakdown of plans, pricing, activation tips, and how to avoid unexpected charges while abroad.
Planning a trip to Japan? Staying connected with your Singapore number is easy using StarHub roaming Japan options, available for postpaid and prepaid users.
Whether you’re navigating Tokyo or exploring Kyoto, you can access mobile data, calls, and texts with StarHub roaming in Japan. This guide breaks down everything you need to know about it, including pricing and how to activate your plan.
You’ll also discover Holafly’s eSIM for Japan, a seamless StarHub alternative with unlimited data and no contract.
Avoid excessive roaming fees
Don't get caught out by data roaming charges in Japan. Use local networks at local rates.
Does StarHub offer roaming in Japan?
Yes, StarHub supports roaming in Japan for postpaid and prepaid customers. Once you activate a plan, your phone connects automatically to local networks like SoftBank, NTT Docomo, or KDDI, ensuring strong 4G coverage throughout the country.
To avoid unexpected roaming charges, it’s recommended to activate a roaming add-on before you start using mobile internet in Japan.
StarHub Japan roaming plans
StarHub offers a mix of short-term and multi-region roaming plans that include Japan, tailored for both postpaid and prepaid users.
These roaming add-ons provide fixed data allowances for a set duration, helping you stay connected in Japan while avoiding unexpected pay-per-use charges.
StarHub postpaid roaming in Japan
Using a postpaid StarHub line in Japan? You can avoid steep roaming charges by activating one of StarHub’s DataTravel add-ons, offering fixed data allowances at flat rates.
These plans give you more control over your usage, whether you’re in Japan for a few days or staying longer.
Here’s what you can choose from:
| Plan | Data | Price (SGD) | Validity |
|---|---|---|---|
| DataTravel Asia Pacific | 1 GB | $6 | 3 days |
| DataTravel Asia Pacific | 8 GB | $16 | 30 days |
| DataTravel Asia Pacific | 12 GB | $20 | 30 days |
| DataTravel Global | 8 GB | $40 | 30 days |
| DataTravel Global | 12 GB | $50 | 30 days |
| DataTravel Everywhere | 1 GB | $80 | 30 days |
| DataTravel Unlimited* | Unlimited | $30/day | per day |
| RoamEasy Daily* | 100MB | $10/day | per day |
* Unlimited and RoamEasy plans aren’t available for Star Plan users
StarHub prepaid roaming in Japan
If you’re using a StarHub prepaid SIM, you can stay connected in Japan by activating one of the available WOW Data Plans.
These add-ons offer fixed data packages for a set period, perfect for short trips or light browsing without the risk of unexpected charges.
Here are your prepaid StarHub Japan roaming options:
| Plan | Data | Price (SGD) | Validity |
|---|---|---|---|
| WOW Data Plan | 1 GB | $5 | 3 days |
| WOW Data Plan | 1 GB | $8 | 1 week |
| WOW Data Plan | 1 GB | $10 | 4 weeks |
| WOW Data Plan | 2 GB | $18 | 4 weeks |
| WOW Data Plan | 4 GB | $25 | 4 weeks |
StarHub Japan pay-as-you-roam charges
If you don’t activate a roaming plan, StarHub will charge you SGD $10 per 100MB of data usage in Japan, plus an additional 20% surcharge. This rate applies automatically whenever you use data abroad without a roaming add-on.
To put that into perspective, watching a few Instagram Reels or checking your messages for just 10 minutes could use around 150–200MB, costing you SGD $12 to SGD $15.
To prevent these high charges, it’s best to calculate your estimated data usage in advance and choose a proper StarHub Japan roaming plan.
How to activate StarHub roaming in Japan
Activating StarHub Japan roaming is quick, but it’s best to set it up before you leave Singapore to avoid any connection issues abroad. Here is how to do it:
- Postpaid users: Activate your roaming plan through the StarHub App or by sending the appropriate SMS code.
- Prepaid users: Dial *123# or use the StarHub Prepaid App to choose and activate your plan.
StarHub roaming in Japan automatically connects your phone to a preferred local network as soon as you land. If it doesn’t, you can manually select a network from your phone’s settings under Mobile Network > Network Selection.
Enjoy unlimited data for your Japan trip with Holafly eSIM
If you’re looking for a hassle-free alternative to StarHub, the Holafly Japan eSIM gives you unlimited data, fast activation, and reliable coverage across the country, without worrying about usage caps or surprise fees.
Choose a daily eSIM plan from just SGD $8.00, or opt for a monthly Holafly Plans subscription at USD $49.90 per month, ideal for digital nomads, remote workers, and frequent travellers who need ongoing connectivity.
Here’s what Holafly includes:
- Unlimited data at 5G speeds
- Coverage across Japan and 170+ global destinations
- 24/7 multilingual customer support
- Hotspot sharing and tethering
Instant activation via QR code with no SIM swap needed
With Holafly eSIM, you can enjoy your time in Japan without worrying about data limits, slow speeds, or surprise fees, just smooth, unlimited connectivity from day one.
Avoid hidden data costs
Get the full price upfront with a Holafly eSIM for Japan. Enjoy unlimited data at no extra cost.
Disclaimer: The data in this article is accurate as of October 21st, 2025, and is subject to change.
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Formerly a travel journalist turned marketing copywriter, I found my way back to the travel world with Holafly—my dream company that made remote work possible. My motto? “Dream big and make it happen.” I’m passionate about writing, exploring the world, and staying active through walking, running, swimming, and hiking. I also love learning, reflecting, and connecting with inspiring minds.
